Uriel Enterprises

Current Sensing Relay (CSR) in HVAC & BMS – Can It Detect Belt Breaks or Shaft Jams

Here’s the truth 👇🔹 Belt Broken (Fan Blower)(**) Possible with adjustable CSRMeasure normal fan motor running current (e.g., 3.2 A).Set CSR threshold slightly lower (say 2.0–2.5 A).If belt snaps, motor runs unloaded (~1.0 A) → CSR ...

September 11, 2025

Screwed (Threaded) Control Valves in HVAC/BMS

When it comes to control valve selection, connection type plays a big role in system performance, installation speed, and long-term reliability. Today, let’s talk about Screwed (Threaded) Control Valves 👇🟢 Connection Type: Male&ndash...

September 3, 2025

Why External Static Pressure (ESP) Always Considers Dirty Filters

When we talk about minimum external static pressure (ESP) in HVAC/BMS design, it’s not just about ducts and fittings. 👉 It’s about real-world operating conditions. 💡 Key Insight:ESP is always calculated with dirty filters taken into a...

September 2, 2025

Dual Temperature Water System – Practical Benefits

In many commercial and institutional buildings, a Dual Temperature Water System uses the same supply & return piping to distribute chilled water in summer and hot water in winter. Practical Advantages🟢One Piping NetworkExample: Instead ...

September 1, 2025

EPO Interlocks in BMS – Why They Matter

In mission-critical facilities like Data Centres, Control Rooms, and Hospitals, the Emergency Power Off (EPO) system is a life-safety safeguard. From a BMS perspective, EPO is more than just cutting power — it’s about coordinated...

September 1, 2025

Why Generator & Damper Interlock Matters in Critical Facilities

When a generator starts, it produces massive exhaust gases that must be safely discharged. If exhaust dampers fail to open, backpressure can damage the engine, overheat the system, and even create hazardous conditions. That’s why we us...

September 1, 2025

Room Pressure Monitoring in Hospitals – More Than a Device, It’s a Compliance & Safety Necessity

In healthcare projects, every design decision directly impacts patient safety. One critical yet often underestimated aspect is room pressure monitoring. 🔹 Why It MattersInfection Control: Prevents airborne contaminants from leaking into cle...

September 1, 2025

Spring Return vs. Non-Spring Return Actuators – What Do Specs Really Call For?

When reviewing project specifications, actuator selection is not just preference. It’s a compliance checkpoint. 🔹 Spring Return Actuators (Fail-Safe Required)Specs usually call for spring return when:a. Fire & smoke dampers (UL555/UL555S ...

September 1, 2025

Ever heard of a Piezo Ring AFMS in a supply blower

Many HVAC professionals often confuse differential pressure transducers with velocity sensors — but they serve different purposes, even though they can be related! 🔹 Differential Pressure Transducer (DPT)– Measures pressure diff...

September 1, 2025

Are Differential Pressure Transducers and Velocity Sensors the Same?

September 1, 2025

Protect Your HVAC Units with Smart Leak Detection

One small leak can lead to major damage — unless you're prepared.That’s why we integrate a Galvanized Steel Drip Pan with a Leak Detection System wired directly to your BMS. How it works:✅ Leak sensor detects water in the drip pa...

September 1, 2025

Circulation Pump vs Freeze Protection vs Low Ambient Protection — What’s the Difference in HVAC/BMS

In cold weather conditions, protecting HVAC systems isn’t just about heating — it’s about smart control logic and design. Here’s how three commonly confused terms differ Circulation PumpEnsures continuous water flow (...

September 1, 2025

Understanding Alarm Classifications in BMS – Why It Matters

In any Building Management System (BMS), alarm processing isn't just about triggering a sound—it's about prioritizing actions, ensuring safety, and giving operators the right tools to respond effectively. Here’s how alarms are ty...

September 1, 2025

BAS Programming Tip: Don’t Forget Water Flush Mode

In Building Automation Systems (BAS), we often focus on temperature control, energy optimization, and occupancy strategies — but what about water stagnation in our terminal units? Introducing a Water Flush Mode for cooling and heating coils can...

September 1, 2025

What is Mount Recessed?

Ever noticed how some devices blend seamlessly into walls or ceilings without sticking out? That’s called a "Recessed Mount" — a method where the equipment is installed inside a surface (like a wall, ceiling, o👉 It doesn't protrude &mda...

September 1, 2025

What does “Mechanical Cooling” really mean in Building Automation

In many HVAC project specs, we see phrases like:The room sensors shall control heating, mechanical cooling, and economizer operation... But what exactly is mechanical cooling? Mechanical Cooling refers to any cooling method that uses powere...

September 1, 2025

Understanding Access Levels in Building Management Systems (BMS)

When designing or managing a Building Automation System (BAS/BMS), one of the most critical factors is Access Control — who can do what within the system. ✅ A well-structured BMS must support at least six distinct access levels, either individ...

September 1, 2025

HVAC Insight: Are Your Fresh Air Systems Smarter Yet

The motor operated damper on the associated fresh air intake shall modulate, indexed to the corresponding fan speed. This one line says a lot — but have you really thought about what it means?✅ As the fan ramps up, the damper opens wider to al...

September 1, 2025

Upstream vs Downstream – What’s the Difference in HVAC

Ever wondered what “upstream” and “downstream” really mean in your HVAC system? Here’s a simple breakdown: **Upstream** refers to the section **before** a component—where air or water is approaching it—while ...

September 1, 2025

Steam Valve Fail Position – NC or NO? Let’s Clear the Confusion!

In steam control applications, selecting the correct fail-safe position of a valve is not just about technical specifications—it’s about ensuring safety, maintaining performance, and serving the purpose of the system. The industry standar...

September 1, 2025

Why Pre-Purge & Post-Purge Sequences Matter in HVAC Control

When it comes to indoor air quality and energy-efficient HVAC operations, transition modes like Pre-Purge and Post-Purge play a vital role—especially in large buildings with scheduled occupancy. Pre-Purge (Unoccupied ➝ Occupied)Before ...

September 1, 2025

ECM vs. VFD: Who Gets the 0-10V Signal?

Understanding Control Signal Compatibility in HVAC Systems In the world of HVAC controls, modulating fan speed plays a critical role in achieving energy efficiency and occupant comfort. Both ECM (Electronically Commutated Motors) and VFDs (V...

September 1, 2025

Smart Buildings & Sustainability: How BMS Drives LEED & Green Certifications

Smart Buildings & Sustainability: How BMS Drives LEED & Green CertificationsBuilding Management Systems (BMS) optimize energy use, monitor environmental conditions, and control HVAC, lighting, and water systems—key factors in achieving ...

September 1, 2025

Why Supply Voltage & Nominal Voltage Matter in HVAC Controls & BAS

Understanding voltage is critical to ensuring reliable Building Automation Systems (BAS) and HVAC control performance. 1. Controller & Actuator Performance Fluctuating supply voltage can cause controllers, actuators, and dampers to beha...

September 1, 2025

Voltage Clarity: Nominal vs. Supply – Know the Difference!

Understand the key difference: Nominal voltage is the standard system rating, while supply voltage is the actual measured voltage delivered—crucial for accurate design, safety, and equipment performance. Supply Voltage This is the act...

September 1, 2025

FPS System Design: Engineering Best Practices for Reliability & Efficiency

FPS System Design: Engineering Best Practices for Reliability & Efficiency focuses on fire risk assessment, hydraulic calculations, zoning, and explosion-proof solutions to ensure safe, reliable, and efficient fire protection system (FPS) design ...

September 1, 2025

Prevent Costly HVAC Failures with a Simple Dry Switch Monitor!

Dry contact monitoring is a critical component in HVAC and Building Automation Systems (BAS), designed to enhance equipment protection, safety, and efficiency. By detecting key process conditions—such as water flow, pressure, or switch position...

September 1, 2025

Don't Wait for a Fire Emergency! Here’s How FPS Engineering Saves Lives!

A Fire Protection System (FPS) is composed of several subsystems designed to protect life and property. These include fire detection, suppression, and prevention systems. a. Fire Detection Systems These systems identify fire hazards early, tr...

September 1, 2025

HVAC Controls vs. BMS: What’s the Difference?

Many people in the industry use HVAC Controls and Building Management Systems (BMS) interchangeably, but are they really the same? Let’s break it down! HVAC Controls – The Specialist Focuses only on Heating, Ventilation, and Air...

September 1, 2025

Smart Buildings, Smarter Future: Why BMS is the of Modern Infrastructure!

BMS isn’t a luxury—it’s a necessity for energy-efficient, sustainable, and intelligent buildings. Whether you’re in HVAC, facility management, or real estate, investing in BMS is the smartest decision you can make. En...

September 1, 2025

Breathe Easy: How ASHRAE Standards Ensure Healthy CO₂ Levels Indoors

Did you know that high CO₂ levels in enclosed spaces can lead to poor air quality, reduced cognitive function, and energy inefficiencies? Recommended Maximum Indoor CO₂ Level: 1,000 ppm Based on maintaining CO₂ levels within 700 ppm above o...

September 1, 2025

Boosting HVAC Efficiency: ASHRAE 90.1’s 15°F ΔT Requirement for Chilled-Water Coils

In ASHRAE Standard 90.1-2016, a critical update was introduced: Chilled-water cooling coils must now be selected with a minimum 15°F temperature difference (ΔT) between the entering and leaving water temperatures at design conditions. What...

September 1, 2025

Why Every IDF Room Needs Proper Ventilation, Alarms & Clear Signage

Did you know? The Intermediate Distribution Frame (IDF) Room is the backbone of your building’s network infrastructure. It houses critical IT and telecom equipment, but often, its maintenance is overlooked. Exhaust Fans for Cooling IDF ...

September 1, 2025

Never Miss this Information in your Control Submittal

Never Miss this Information in your Control Submittal Submittal documents contain crucial information about the document itself, the preparer, the review process, and the dates items were sent and received. When contractors send a submittal package,...

September 20, 2024

Greatest Time of All Control Contractor in Graphics Generation

Greatest Time of All Control Contractor in Graphics Generation Creating Graphics Based on Total Building HVAC Equipment CountFor Example, if the first floor has 10 identical VAVs, you might initially need to generate 10 separate pages of graphics to...

September 13, 2024

"Does Smart Building Automation Truly Enhance Energy Efficiency?"

Building Automation Systems are evolving rapidly, with many Controls & HVAC Contractors aiming to deliver smart solutions. However, it's essential to focus on energy performance during the design and engineering stages. Often, engineers overlook ...

September 5, 2024

Why 3D floor plan important in Building Automation

When providing building automation controls, avoid overly complex 3D floor plans that don't allow for clear visualization of Ice & Fire animations for zones. Instead, create a straightforward 3D floor plan with ample space for thermographic displ...

August 31, 2024

11 Things Important in HVAC Control Submitta

1. Network Riser2. BAS Control Panel3. Equipment Flow Diagram4. Sequence of Operation5. IO Points Hardaware Schedule6. Point To Point Wiring7. Valve Schedule8. Damper Schedule9. Room Schedule10. Bill of Material11. Control Catalog

August 28, 2024

10 - Important Process HVAC Control Or Mechanical Contractor Can't Avoid In BMS Automation

1. Pre Sales Engineering - Estimation & Proposal2. Hardware Engineering - Control Submittal3. Software Engineering - Application Program 4. Floor Plan Design - 2D Or 3D Floor Plan5. Graphics - User Graphics & Navigation 6. Commissioning - Onl...

August 26, 2024

9- Steps Important In BAS Pre-Sales Engineering For HVAC Mechanical Or Control Contractor

1. Highlight Important Points In Specification2. Mark Up MEP Drawings 3. Prepare The Take Off Sheet4. Prepare The Request For Information Sheet5. Clarify The Request For Information from Client6. Prepare AFMS, Damper, Valve, VFD, Meters Schedule7. Pr...

August 25, 2024

Never Do This Mistake If You Are HVAC Mechanical Or Control Contractor

1. Design Control Submittal At Site2. Creating Multiple Revisons on Control Submittal3. DDC Sizing at Site And Changing Panel4. Standard Input Output Point Tagging Not Appropriate 5. Input Output Point Tag Mismatch Between Database And DDC Program 6....

August 24, 2024

7-Steps Important In Damper Actuator Torque Calculation

1. Duct width 2. Duct height 3. Calculate the area of duct 4. Holding Torque of parallel Blade Dampers 5. Holding Torque of Opposed Blade Dampers 6. Multiply area with holding Torque as per dampers blade type to get actual torque7. Consider Safety fa...

May 14, 2024

Never Miss Following things In Valve Schedule

1. Valve Family - Globe, Ball, Flange 2. Configuration - 2Way, 3 Way3. Fail Position - Valve Open Or Valve Close4. Inlet Pipe Size - in inch5. Valve Size - in inch6. Medium - Water or Liquid 7. Flow - GPM or Lbs/hr or MBH8. Design Delta P -9. Valve D...

May 14, 2024

Latest Posts

Current Sensing Relay (CSR) in HVAC & BMS – Can It Detect Belt Breaks or Shaft Jams

September 11, 2025

Screwed (Threaded) Control Valves in HVAC/BMS

September 3, 2025

Why External Static Pressure (ESP) Always Considers Dirty Filters

September 2, 2025

Dual Temperature Water System – Practical Benefits

September 1, 2025

EPO Interlocks in BMS – Why They Matter

September 1, 2025